I'd hesitate to suggest logging out/in to the app but that might fix it. If you do, make sure you have the key card with you. If you are unable to log back in due to Tesla server issues, the bluetooth lock/unlock functionality is deauthorized and you're stuck.
Just had the same issue again today seems like a problem with my LTE. Just keeps connecting and disconnecting over and over again. I have no traffic data, no streaming music, no ablilty to preheat the car or use summon.
So.. at least its not an issue with the app... lol